/***********************************************************************
 * BinTrotter : BitTorrent library/client for the Android operating system.
 *  
 * Copyright (C) 2009, Christopher David Stones (chris.stones@gmail.com)
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 ***********************************************************************/

package org.bintrotter.apeer.receivestates;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;

import org.bintrotter.apeer.Peer;

public class PieceBegin implements ReceiveState {

	private Peer		m_peer;
	private int			m_begin;
	private SocketChannel sc;
	private ByteBuffer	bb;
	
	public PieceBegin(Peer peer) {
		
		m_peer = peer;
		m_begin = -1;
	}
	
	public int begin() {
		
		return m_begin;
	}
	
	@Override
	public void reset() {
		
		if(bb == null)
			bb = ByteBuffer.allocate(4);
		else
			bb.rewind();
		m_begin = -1;
		sc = m_peer.channel();
		m_begin = -1;
	}

	@Override
	public States update() {
		
		
		try {
			
			sc.read(bb);
			
			if(bb.hasRemaining() == false) {
				
				m_begin = bb.getInt(0);
				
				return States.PIECE_BLOCK;
			}
			
		} catch (IOException e) {
			
			return States.SHUTDOWN;
		}
		return States.PIECE_BEGIN;
	}
}
